need to replace side spring assembly for window.

A handy person from Jacksonville Florida says:
March 5, 2017
Window slams down, will not stay up. I have removed the two aluminum cartrages on the each side of the window. They actually fell out. one is intact, the other the string assembly has come apart from the pulleys. The cartrages are marked "28 3 C H".

I need help figuring out which to order. Attaching a couple pics

Thanks,
Rob
Channel balance
A handy person from Jacksonville Florida says:
March 5, 2017
two more pics
Profile picture of Paul
Paul from SWISCO responded:
March 10, 2017
I'm not sure what to recommend. It would come down to our S390-29 or S351-29. The only difference between these two balances is the size of the shoe. You will need to measure yours, then refer to the dimensions we show for each part to confirm the best match.
29" Series 351 Channel Balance
29" Series 351 Channel Balance
S351-29
$11.10
29" Series 390 Channel Balance
29" Series 390 Channel Balance
S390-29
$11.10
How to Replace a Non-Tilt Channel Balance
How to Replace a Non-Tilt Channel Balance
VIDEO
WATCH >
How to Repair a Jammed Window
How to Repair a Jammed Window
VIDEO
WATCH >
How to Identify Replacement Channel Balances
How to Identify Replacement Channel Balances
VIDEO
WATCH >
How to replace a non-tilt channel balance
How to replace a non-tilt channel balance
GUIDE
READ >
Choosing a Non-tilt Channel Balance: What Will We Need?
Choosing a Non-tilt Channel Balance: What Will We Need?
GUIDE
READ >
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 3-4 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.